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California Air Resources Board (CARB)

California Air Resources Board (CARB)

United States



In response to Assembly Bill (AB) 617 (C. Garcia, Chapter 136, Statutes of 2017), CARB established the Community Air Protection Program (CAPP or Program). The Program’s focus is to reduce exposure in communities most impacted by air pollution. Communities around the State are working together to develop and implement new strategies to measure air pollution and reduce health impacts.

This first-of-its-kind statewide effort includes community air monitoring and community emissions reduction programs. In addition, the Legislature appropriated funding to support early actions to address localized air pollution through targeted incentive funding to deploy cleaner technologies in these communities, as well as grants to support community participation in the AB 617 process. AB 617 also includes new requirements for accelerated retrofit of pollution controls on industrial sources, increased penalty fees, and greater transparency and availability of air quality and emissions data, which will help advance air pollution control efforts throughout the State. This new effort provides an opportunity to continue to enhance our air quality planning efforts and better integrate community, regional, and State level programs to provide clean air for all Californians.

CARB, local air districts, community members, and other stakeholders are already learning from initial efforts and integrating lessons learned into our implementation. We welcome and encourage your participation in this effort




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16 July 2021


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Mr. Carlos Agudelo, Link Engineering, UNITED STATES

Mr. Jeff Long, California Air Resources Board (CARB), UNITED STATES

Dr. Seungju Yoon, California Air Resources Board (CARB), UNITED STATES

Dr. Sam Pournazeri, California Air Resources Board (CARB), UNITED STATES

Dr. Jorn Herner, California Air Resources Board (CARB), UNITED STATES

Mr. Alan Stanard, Eastern Research Group (ERG), UNITED STATES

Mr. Sandeep Kishan, Eastern Research Group (ERG), UNITED STATES

Dr. Sonya Collier, California Air Resources Board, UNITED STATES

Dr. Ravi Vedula, Link Engineering. (LINK), UNITED STATES

Mr. Radoslaw Markiewicz, Link Engineering. (LINK), UNITED STATES

Dr. Simon Bisrat, California Department of Transportation (Caltrans), UNITED STATES

Mr. Jason Lee, California Department of Transportation (Caltrans), UNITED STATES

Mr. Chad Bailey, U.S. Environmental Protection Agency (U.S. EPA), UNITED STATES

Dr. Michael Aldridge, U.S. Environmental Protection Agency (U.S. EPA), UNITED STATES

Dr. Michael Hays, U.S. Environmental Protection Agency (U.S. EPA), UNITED STATES

Dr. Bob Giannelli, U.S. Environmental Protec

The mission of the California Air Resources Board (CARB) is to protect public health and mitigate the effects of climate change through regulatory and incentive programs. Regulatory measures at the vehicle tailpipe have led to substantial decreases in emissions, improvement in air quality and positive health outcomes.

Although regulations on tailpipe exhaust have resulted in significant decreases in particulate matter (PM) and other pollutants, non-exhaust sources, such as brake-wear PM, are modeled as dominant sources of vehicle PM by emission inventory models such as CARB’s EMFAC and US EPA’s MOVES models. However, both of these models primarily rely on old datasets and assumptions. As the non-exhaust emissions come to dominate total emissions, updates to emission factors and assumption are needed. They also do not take into account the likely decreases in brake-wear PM that will occur from fleet turnover and increased market share of vehicles equipped with regenerative braking.

To reduce uncertainties in current treatment of brake-wear PM emissions, CARB, in collaboration with Caltrans and U.S. EPA, is exploring various methods to quantify brake-wear PM emission rates. This includes controlled laboratory methods as well as roadside studies. Using recently developed testing methods, CARB is testing modern brake materials, under realistic braking behavior, testing various vehicle types and weights, and sampling with state-of-the-art PM measurement technologies. Laboratory methods will be used to develop new emission factors and source profiles, which can be used to estimate impacts of brake-wear in near-roadway environments. With this effort, CARB will improve EMFAC’s treatment of brake-wear PM and to characterize the exposure potential of populations living near major roadways to better understand the impact of this source on California’s air quality.

EuroBrake 2021




Real-World Brake-Wear Emission Factors – California's Perspective, EB2020-EBS-038, EuroBrake 2021

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